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-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0750-thermal-Add-BCM2711-thermal-driver.patch173
1 files changed, 173 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0750-thermal-Add-BCM2711-thermal-driver.patch b/target/linux/bcm27xx/patches-5.4/950-0750-thermal-Add-BCM2711-thermal-driver.patch
new file mode 100644
index 0000000000..d7e438fd72
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0750-thermal-Add-BCM2711-thermal-driver.patch
@@ -0,0 +1,173 @@
+From 84477b71c184345517625f5c3eccf26a29eac4df Mon Sep 17 00:00:00 2001
+From: Stefan Wahren <stefan.wahren@i2se.com>
+Date: Mon, 13 Jan 2020 19:56:16 +0100
+Subject: [PATCH] thermal: Add BCM2711 thermal driver
+
+Commit 59b781352dc4cb9ae27a8ddae0cda979d29d8af7 upstream.
+
+This adds the thermal sensor driver for the Broadcom BCM2711 SoC,
+which is placed on the Raspberry Pi 4. The driver only provides
+SoC temperature reading so far.
+
+Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
+Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
+Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
+Link: https://lore.kernel.org/r/1578941778-23321-3-git-send-email-stefan.wahren@i2se.com
+Signed-off-by: Chen-Yu Tsai <wens@csie.org>
+---
+ drivers/thermal/broadcom/Kconfig | 7 ++
+ drivers/thermal/broadcom/Makefile | 1 +
+ drivers/thermal/broadcom/bcm2711_thermal.c | 123 +++++++++++++++++++++
+ 3 files changed, 131 insertions(+)
+ create mode 100644 drivers/thermal/broadcom/bcm2711_thermal.c
+
+--- a/drivers/thermal/broadcom/Kconfig
++++ b/drivers/thermal/broadcom/Kconfig
+@@ -1,4 +1,11 @@
+ # SPDX-License-Identifier: GPL-2.0-only
++config BCM2711_THERMAL
++ tristate "Broadcom AVS RO thermal sensor driver"
++ depends on ARCH_BCM2835 || COMPILE_TEST
++ depends on THERMAL_OF && MFD_SYSCON
++ help
++ Support for thermal sensors on Broadcom BCM2711 SoCs.
++
+ config BCM2835_THERMAL
+ tristate "Thermal sensors on bcm2835 SoC"
+ depends on ARCH_BCM2835 || COMPILE_TEST
+--- a/drivers/thermal/broadcom/Makefile
++++ b/drivers/thermal/broadcom/Makefile
+@@ -1,4 +1,5 @@
+ # SPDX-License-Identifier: GPL-2.0-only
++obj-$(CONFIG_BCM2711_THERMAL) += bcm2711_thermal.o
+ obj-$(CONFIG_BCM2835_THERMAL) += bcm2835_thermal.o
+ obj-$(CONFIG_BRCMSTB_THERMAL) += brcmstb_thermal.o
+ obj-$(CONFIG_BCM_NS_THERMAL) += ns-thermal.o
+--- /dev/null
++++ b/drivers/thermal/broadcom/bcm2711_thermal.c
+@@ -0,0 +1,123 @@
++// SPDX-License-Identifier: GPL-2.0+
++/*
++ * Broadcom AVS RO thermal sensor driver
++ *
++ * based on brcmstb_thermal
++ *
++ * Copyright (C) 2020 Stefan Wahren
++ */
++
++#include <linux/bitops.h>
++#include <linux/clk.h>
++#include <linux/device.h>
++#include <linux/err.h>
++#include <linux/io.h>
++#include <linux/kernel.h>
++#include <linux/mfd/syscon.h>
++#include <linux/module.h>
++#include <linux/platform_device.h>
++#include <linux/of_device.h>
++#include <linux/regmap.h>
++#include <linux/thermal.h>
++
++#include "../thermal_hwmon.h"
++
++#define AVS_RO_TEMP_STATUS 0x200
++#define AVS_RO_TEMP_STATUS_VALID_MSK (BIT(16) | BIT(10))
++#define AVS_RO_TEMP_STATUS_DATA_MSK GENMASK(9, 0)
++
++struct bcm2711_thermal_priv {
++ struct regmap *regmap;
++ struct thermal_zone_device *thermal;
++};
++
++static int bcm2711_get_temp(void *data, int *temp)
++{
++ struct bcm2711_thermal_priv *priv = data;
++ int slope = thermal_zone_get_slope(priv->thermal);
++ int offset = thermal_zone_get_offset(priv->thermal);
++ u32 val;
++ int ret;
++ long t;
++
++ ret = regmap_read(priv->regmap, AVS_RO_TEMP_STATUS, &val);
++ if (ret)
++ return ret;
++
++ if (!(val & AVS_RO_TEMP_STATUS_VALID_MSK))
++ return -EIO;
++
++ val &= AVS_RO_TEMP_STATUS_DATA_MSK;
++
++ /* Convert a HW code to a temperature reading (millidegree celsius) */
++ t = slope * val + offset;
++
++ *temp = t < 0 ? 0 : t;
++
++ return 0;
++}
++
++static const struct thermal_zone_of_device_ops bcm2711_thermal_of_ops = {
++ .get_temp = bcm2711_get_temp,
++};
++
++static const struct of_device_id bcm2711_thermal_id_table[] = {
++ { .compatible = "brcm,bcm2711-thermal" },
++ {},
++};
++MODULE_DEVICE_TABLE(of, bcm2711_thermal_id_table);
++
++static int bcm2711_thermal_probe(struct platform_device *pdev)
++{
++ struct thermal_zone_device *thermal;
++ struct bcm2711_thermal_priv *priv;
++ struct device *dev = &pdev->dev;
++ struct device_node *parent;
++ struct regmap *regmap;
++ int ret;
++
++ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
++ if (!priv)
++ return -ENOMEM;
++
++ /* get regmap from syscon node */
++ parent = of_get_parent(dev->of_node); /* parent should be syscon node */
++ regmap = syscon_node_to_regmap(parent);
++ of_node_put(parent);
++ if (IS_ERR(regmap)) {
++ ret = PTR_ERR(regmap);
++ dev_err(dev, "failed to get regmap: %d\n", ret);
++ return ret;
++ }
++ priv->regmap = regmap;
++
++ thermal = devm_thermal_zone_of_sensor_register(dev, 0, priv,
++ &bcm2711_thermal_of_ops);
++ if (IS_ERR(thermal)) {
++ ret = PTR_ERR(thermal);
++ dev_err(dev, "could not register sensor: %d\n", ret);
++ return ret;
++ }
++
++ priv->thermal = thermal;
++
++ thermal->tzp->no_hwmon = false;
++ ret = thermal_add_hwmon_sysfs(thermal);
++ if (ret)
++ return ret;
++
++ return 0;
++}
++
++static struct platform_driver bcm2711_thermal_driver = {
++ .probe = bcm2711_thermal_probe,
++ .driver = {
++ .name = "bcm2711_thermal",
++ .of_match_table = bcm2711_thermal_id_table,
++ },
++};
++module_platform_driver(bcm2711_thermal_driver);
++
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Stefan Wahren");
++MODULE_DESCRIPTION("Broadcom AVS RO thermal sensor driver");